ZyXEL Communications P-312 manual SUA Single User Account Versus NAT, NAT Mapping Types

P312 Broadband Security Gateway

2.Many to One: In Many-to-One mode, the Prestige maps multiple local IP addresses to one global IP address. This is equivalent to SUA (i.e., PAT, port address translation), ZyXEL’s Single User Account feature that previous ZyXEL routers supported (the SUA Only option in today’s routers).

3.Many to Many Overload: In Many-to-Many Overload mode, the Prestige maps the multiple local IP addresses to shared global IP addresses.

4.Many to Many No Overload: In Many-to-Many No Overload mode, the Prestige maps the each local IP addresses to unique global IP addresses.

5.Server: This type allows you to specify inside servers of different services behind the NAT to be accessible to the outside world.

Port numbers do not change for One-to-One and Many-to-Many-No Overload NAT

mapping types.

The following table summarizes these types.

Table 6-2 NAT Mapping Types

Type	IP Mapping	SMT abbreviation
One-to-One	ILA1!" IGA1	1:1
Many-to-One (SUA/PAT)	ILA1!" IGA1	M:1
	ILA2!" IGA1
	…
Many-to-Many Overload	ILA1!" IGA1	M:M Ov
	ILA2!" IGA2
	ILA3!" IGA1
	ILA4!" IGA2
	…
Many-to-Many No Overload	ILA1!" IGA1	M:M No Ov
	ILA2!" IGA2
	ILA3!" IGA3
	…
Server	Server 1 IP!" IGA1	Server
	Server 2 IP!" IGA1
	Server 3 IP!" IGA1

6.1.5 SUA (Single User Account) Versus NAT

SUA (Single User Account) in previous ZyNOS versions is a subset of NAT that supports two types of mapping, Many-to-Oneand Server. See section 6.2.3 for a detailed description of the NAT set for SUA. The Prestige now has Full Feature NAT support to map global IP addresses to local IP addresses of clients or servers using all mapping types as outlined in Table 6-2.The Prestige supports NAT sets on a

NAT 6-3